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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6da5cd20a1a2de69b193d8e8c7a5b1c60c74131cb4dd0d8451726a95e7fa339' 
  AND token = 'R+M99opY+nVe7IdxlE+UjstyKb8y1Z06WhhPSNE4mbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}